Dynamic balancer for rotary bodies



Nov. 15, 1955 L. HUNTER, JR

DYNAMIC BALANCER FOR ROTARY BODIES 4 Sheets-Sheet 1 Filed Aug. 24, 1953FIG. I.

3/ INVENTOR. 7

FIG. 4. LEE HUNTER JR.

fiffO/BWHG NOV. 15, 1955 U JR 2,723,555

DYNAMIC BALANCER FOR ROTARY BODIES Filed Aug. 24, 1953 4 Sheets-Sheet 2a 74 /7 f; m

9 fi- 8 7 7 38 m I FIG. 5.

INVENTOR. LEE HUNTER JR.

Nov. 15, 1955 Filed Aug. 24, 1953 L. HUNTER, JR

DYNAMIC BALANCER FOR ROTARY BODIES 4 Sheets-Sheet 5 INVENTOR. LEE HUNTERJR.

1955 HUNTER, JR 2,723,555

DYNAMIC BALANCER FOR ROTARY BODIES Filed Aug. 24, 1955 4 Sheets-Sheet 4INVENTOR.

LEE HUNTER JR.

////iiu% gigzlm United States Patent Ofiiice 1 2,723,555 DYNAMICBALANCER FOR ROTARY BODIES Lee Hunter, Jr., Chesterfield, M0.

Original application August 11, 1949, Serial No. 109,641, now Patent No.2,662,396, dated December 15, 1953. Divided and this application August24, 1953, Serial No. 375,880

8 Claims. (Cl. 73-66) This invention relates to devices for balancingrotary bodies, such as automobile wheels. The principal object of theinvention is to provide a device that can be easily carried by hand andreadily mounted as a complete unit on a wheel for rotation therewith toquickly and accurately determine the amount of unbalance thereof, andthe location and amount of weight required to counterbalance suchunbalance without dismounting the Wheel from the automobile. Otherobjects of the invention are simplicity and cheapness of construction,compactness of design, and lightness of weight.

The invention consists in the wheel assembly device and in the parts andcombinations and arrangement of parts hereinafter described and claimed.

In the drawings:

Fig. 1 is a side elevational view of one side of the front end of amotor vehicle showing the improved wheel balancer installed thereon,

Fig. 2 is an edge view of an automobile wheel, partly in section, andtaken along the line 22 of Fig. 1,

Fig. 3 is a side elevational view, partly in section, of the balancingweight adjusting means,

Fig. 4 is a sectional view taken along the line 44 of Fig. 3,

Fig. 5 is a sectional view taken along the line 5-5 of Fig. 3,

Fig. 6 is a sectional view taken along the line 66 of Fig. 5,

Fig. 7 is a sectional view taken along the line 77 of Fig. 5,

Fig. 8 is a sectional view taken along the line 88 of Fig. 5,

Fig. 9 is a sectional view taken along the line 9-9 of Fig. 5,

Fig. 10 is a plan view of the balancer revealing the balancing weight,

Fig. 11 is a sectional view taken along the line 1111 in Fig. 10, and

Fig. 12 is a plan view of the pointer and balancing Weight indicialooking in the direction of line 12-12 of Fig. 11.

This application constitutes a division of a prior application filedAugust ll, 1949 and now Patent 2,662,396,

dated December 15, 1953. Reference will be made to the structural andoperational description of the form of the invention claimed in saidprior parent application for a better understanding of the form of theinvention claimed herein.

The device is shown in the drawings for determining the unbalance of anautomobile wheel A and to provide information as to the location andamount of weight required to correct such unbalance. The balancercomprises a cage 7 (Figs. 1-9) having a circular outer end wall 8, anannular inner end wall 9 concentric with said outer end wall, twodiametrically opposite longitudinal bridges 10 and 11(Figs. 3 and 8)connecting said outer and inner end walls in axially spaced relation,and a circular plate 12 secured by flatwise screws 13 to an outstandingannular rib 14 formed on the outer end face of said annular end wallaround the inner periphery thereof. The end closure plate 12 extendsradially outwardly of the annular rib 14 and forms therewith and withthe annular inner end wall 9 of the cage 7 a peripheral annular groove15 therein in which is rotatably supported a gear ring 17 Patented Nov.15, 1955 which is riveted to a cup-shaped mounting means having the formof a disc 16 of considerably larger diameter than said inner wall andopens away therefrom. The annular inner end wall 9 of the cage 7 has arim flange 18 extending in the direction of the outer end wall 8 of saidcage; and said cage is provided with a cylindrical casing or cover 19whose inner end seats on and is secured by screws 20 to said rim flangeand whose outer end has an inturned annular flange 21 seating againstthe outer face of the outer end wall 8 of said cage. The cage 7 with itscasing 19 forms a closed cylindrical housing or frame structure and therotary connection between the inner end of said frame structure and thecup-shaped mounting means or disc 16 permits relative rotary movement ofsaid closed frame structure and mounting means.

Extending through an axial hole provided therefor in the inner end wall9 of the cage 7 is a stud 22 having an annular shoulder 23 that abutsagainst the outer face of said wall and a threaded inner end portion onwhich is threaded a nut 24 for rigidly clamping said stud to said plate.The closed frame structure carries selectively operable means forrotating the frame structure and the balancing Weight means together orfor changing the radial position of the balancing weight means relativeto the axis of wheel rotation. This assembly will now be described.Extending through cage 7 axially thereof is a shaft 25, one end of whichis journaled in an axial bore 26 provided therefor in stud 22 and theother end of which has a control element or operating knob 25a securedthereto some distance outwardly from the outer end wall 8 of said cage.Located within the cage is a worm 27 which is mounted on shaft 25 forrotation therewith adjacent to the supporting stud 22. The worm 27intermeshes with a worm gear 28 (Fig. 9) fixed to a cross shaft 29journaled near one end in a. bearing 30 provided therefor on thelongitudinal bridge 10 of said cage. At its opposite end the cross shaft29 is journaled in a bearing 31 provided therefor in the annular innerend wall 9 of the cage 7 and is provided with a spur gear 32 thatintermeshes with a spur gear 33 mounted on a shaft 34 supported radiallyof cage 7 in a bearing 36 formed on the inner face of the annular innerend wall 9 of said cage and a bearing 35 (Fig. 5) formed on the innerface of the rim flange 18 of said wall. The spur gear 33 rotates throughan opening 37 which extends through the annular inner end wall 9 of thecage and opens into the annular peripheral groove 15 in the cage; andsaid gear intermeshes with a circular gear rack 38 cut in the disc 17supported in said groove. By this arrangement, relative rotary movementis imparted to cage 7 and the mounting disc by manipulating the knob 25afixed to the exposed outer end of shaft 25.

Journaled on shaft 25 is a tubular shaft 39 (Fig. 4) whose inner endterminates inside the cage 7 Where it is provided with a spur gear 48that intermeshes with a spur gear idler 41 (Figs. 3 and 5) journaled ona pin 42 secured in walls 8 and 9, a combination sleeve and hearing 43spacing the gear 41 from wall 9. The spur gear idler 41 meshes withanother spur gear idler 44 (Fig. 6) journaled on a pin 45 secured in endwalls 8 and 9 parallel to pin 42. The gear 44 is spaced from wall 9 by acombination sleeve and bearing 46. The gear 44 meshes with a gear 47(Figs. 4 and 5) integral with worm gear 27, each being suitably securedto shaft 25 by means of a pin 48. The tubular shaft 39 extends outwardlybeyond the outer end of the cage 7 where it is provided, just inwardlyof the operating knob 25a, with a control element or operating knob 39a.By this arrangement relative rotary movement may be imparted to the cageand ring gear 17 by means of knob 25a as well as by means of the knob39a.

Journaled on the tubular shaft 39 is a tubular shaft 49 terminatinginside of cage 7 in worm 50 that intermeshes with a worm gear 51 (Figs.5 and 8) fixed to a cross shaft 52 journaled in bearings 53 providedtherefor in the bridge member 11 of the cage. The tubular operatingshaft 49 extends beyond the outer end wall 8 of cage 7 and has a controlelement or operating knob 49a fixed thereto just inwardly of theoperating knob 39a for the operating shaft 39.

Fixed to the cross shaft 52 is a beveled pinion 54 that intermeshescontinuously (Fig. 5) with two beveled gears 55 and 56, respectively.The beveled gear 55 is fixed to a shaft 57 and the beveled gear 56 isfixed to a tubular shaft 58 journaled on shaft 57, both shafts beingdisposed alongside of the tubular shaft 49 in spaced parallel relationthereto. The shaft 57 is supported at one end in a bearing 59 providedtherefor in the outer end wall 8 of the cage 7. At the other or innerend of the cage the shafts 57 and 58 extend through a bushing 60 in ahole in the end wall 9 of the cage. The tubular shaft 58 projects (Figs.5 and 11) beyond the end wall 9 and has a spur gear 61 fixed theretohaving a hub 61a abutting the bushing 60 mounted in the end wall 9. Theshaft 5'7 also has a spur gear 62 secured thereto outwardly of and ofthe same size as spur gear 61 secured to the tubular shaft 58.

Rotatable on the tubular operating shaft 49 and in the central openingin the outer end wall 3 of the cage is a tubular operating shaft 63provided just inside of said cage with a spur gear 64. The shaft 63extends outside of the cage and a control element or operating knob 63::is secured to the outer end of said shaft between the outer end wall ofsaid cage and the operating knob 49a for the tubular operating shaft 49.The spur gear 64 meshes with a spur gear idler 65 (Figs. 5 and 6)journaled on pin 42 and is held in axially spaced relation on said pinfrom gear 41. A sleeve 66 and a combination sleeve and bearing 67 spacesgear 65 from the end wall 8 and from gear 41. The spur gear idler 65meshes with spur gear idler 68 journaled on pin 4-5 and is held inaxially spaced relation with respect to gear 44 by a sleeve 69, and acombination sleeve and bearing 70 spaces gear 68 from the end wall 8.The spur gear idler 68 meshes with spur gear 71 that is disposed (Fig.4) adjacent to and integral with the worm 50 on shaft 49.

The control element or knob 25a is locked to shaft 25 by suitable screwsand the other control elements or knobs are held in spaced relation byabutting the adjacent knob and a shoulder on the shaft on which the knobis carried. The bores of knobs 39a, 49a and 63a have a flat surfacethereon engaging a cooperating flat surface on the respective shafts forpreventing relative rotation between the knobs and the shafts.

A member 72 is disposed between the spur gear 40 and worm 50 on thehollow shaft 39 and pin 4-2 and its associated sleeve 66 and is used asa torque plate for separating worm 50 and gear 40 and preventing theactuation of one gear by the other gear.

Journaled on the central stud 22, between the flange on the flange screw73 therein and the outer face of the end wall 9 of the inner end of cage'7, are two separate arms 74 and 75 disposed radially of said cageinside of the cupshaped mounting disc 16 at said end of the cage andterminating at their respective outer ends in weights, not shown in thisdivisional application, of the same size and shape. The weight arm '74is provided with an arcuate gear rack 77 disposed concentric to thesupporting stud or pivot 22 therefor and intermeshes with the spur gear61 on the tubular countershaft 5S; and the weight arm 75 is providedwith a similar arcuate rack 78 that interincshes with the spur gear 62on the solid countershaft 57. Secured to the weight arm 74 thatintermeshes with the spur gear 61 on the tubular countershaft 58 is apointer 79 offset laterally to extend through an arcuate slot 80 in theend Wall 9, and thence radially outwardly to form an angle and a pointdirectly inside of a transparent window 31 in cover 19. Y The pointer'79 has a projection 79a extending into an aperture 74b in arm 74 forpreventing relative rotation therebetween. The arcuate slot is ofsufiicient length to accommodate an 80 degree relative rotary movementof the pointer 79 and the cage 7; and the window 81 in casing 19 has ascale 82 marked thereon along one are of the pointer and graduated inounces and fractions thereof. The cage casing 19 also has a longitudinalcounterweight locating mark 83 on the outer peripheral surface thereof,said mark being located in a plane disposed radially of cage 7 andpassing through the axes of countershafts 57 and 58 and the axis ofshaft 25 for swinging weight arms 74 and 75 about the axis of the cage7.

The cup-shaped mounting means or disc 16 (Fig. 2) is provided with fourcircumferentially spaced mounting fingers 84 extending radially thereofthrough slots 85 in the outer peripheral wall of said disc just inwardlyof a curled rim portion 86 thereof. Radial adjustment of the finger 84is accomplished in two steps, one large and one small adjustment. By acombination of these adjustments a wide range of radial movement of thefinger 84 is possible, thereby readily adapting the wheel balancer toany type and size of wheel.

The parts within the cage 7 and the casing 19 rotate during a balancingoperation and in order that this portion of the device may be inbalance, a weight 104 (Figs. 7. 8 and 11) is provided that is secured toan arm 105 fastened to bridge 10.

The present form of the invention is illustrated in Figs. 10, l1 and 12of the drawings in which the motion transmitting means from the weightsto knobs 49a and 63a is the same as that shown in the preferredembodiment but in which a radially movable counterweight in the form ofa plate 107 is employed. The plate is provided with a slot 108, thelongitudinal edges of which are displaced so that gear teeth 109 cut inone edge, mesh with gear 61, and gear teeth 110 cut in the other edgemesh with gear 62. Selective rotation of knobs 49a and 63a moves thecounterweight plate 107 radially with respect to the axis of thebalancing device. The plate 107 is slidably mounted in ways 111 carriedby closure plate 12 secured to the end wall 9 and is angularly turned orrotated by knobs 25a and 39a. Suitable indicia 112 for indicating theamount of unbalance of the wheel, is engraved on the wall 8 and apointer 113 is provided on an extension 114 .on shaft 57 for indicatingthe amount of the balancing weight to be attached to the wheel. Thismeans of Fig. 12 also indicates by its position circumferentially of theaxis of the knobs the place on the wheel where the balancing weightshould be attached. In other words, the radial outward location of theshaft extension 114 relative to the center of wall 8 can be used topoint out the proper location on the Wheel for the indicated weight,such as that in Fig. 12, the position of extension 114 indicates theweight should be placed upwardly to the left of a vertical line throughthe center of knob 25a and the center of extension 114.

Means have been provided for preventing the jamming of gears 61 and 62in the gear slots cut in weight arms 74, 75 and in plate 107. The gear55 (Figs. 5 and 7) has an arm 115 secured thereto and provided with ahardened screw 116 engageable with a pin 117 secured to gear 64. Thesegears are so related that arm screw 116 will be engaged by pin 117 justbefore gears 61 and 62 reach the end of travel in the slots of theweight arms 74, 75 and plate 107, thereby preventing further rotation ofknobs 49a and 63a and the parts connected thereto.

When it is desired to balance the automobile wheel A, the hereinbeforedescribed balancing device is mounted on said wheel on vehicle 122concentric with the axis of wheel rotation by placing the cup-shapedmounting disc 16 opposite the outer face of the wheel and seating thecurved ends of the mounting finger 84 of said disc in the concaveannular depression formed in the outside face of the wheel rim by theoutwardly curved peripheral outside marginal rim flange of the rimthereof, said finger having been previously adjusted for the rimdiameter of the wheel. The ends of the mounting fingers 84 are thenpositioned on the rim flanges of the wheel, the curved ends 84a fittingagainst the curve in the wheel rim. By this arrangement the entirebalancing device, including the cage 7, mounting disc 16, andcounterbalancing plate 107, or weighted arms 74 and 75, is secured tothe wheel concentric therewith for rotation about the axis thereof, thecontrol elements being located outwardly of the wheel where they may beeasily manipulated. One of the knobs 49a, 63a is then turned to move thearms 74 and 75 relative to one another into a slidably unbalancedposition, such that both arm weights (not shown). are in a position, saywith the pointer 79 at the 1% oz. position, on the scale 82. The armsmove away from each other when one knob is turned and toward each otherwhen the other knob is turned. The wheel with the balancing devicemounted thereon is then jacked up and rotated on its axis, each of thefront wheels being rotated by means of a suitable power driven spinner123 engaging the tread of the tire on wheel A, and the rear wheels beingdriven from the engine of the automobile.

With the balancing device adjusted and mounted on the wheel in themanner above described, the magnitude and location of the weightrequired to correct the running or dynamic unbalance of the wheel can befound by spinning the wheel at a speed at which such unbalance willproduce considerable vibration and be observed visually or by sense oftouch, then holding the knob 49a or 63a until such vibration is reducedto a minimum, and then holding the knob 250 or 39a until no vibration isproduced by the rotating wheel. The wheel is then stopped and a marknoted on the wheel rim indicating that the counterweight for correctingthe unbalance of the wheel should be attached to the rim at that point,while the radial pointer 79 indicates on the scale 82, the magnitude ofsuch correction weight. A correction weight of the magnitude indicatedon the scale 82 is then applied to the outside flange of the wheel rimat the point indicated by the pointer to thereby correct the unbalanceof the wheel. The balancing device is then removed from the wheel bydisengaging the curved ends 84a of finger 84 from the rim thereof.Stopping or slowing down the rotation of knob 25a with the rotatingwheel, produces relative rotary movement of said wheel and thecounterbalance plate 107, or two balancing weight arms 74 and 75, in onedirection; and stopping or slowing down the rotation of knob 39aproduces relative rotary movement of said wheel and balancing plate orweight arms in the opposite direction. Thus, by manipulating knobs 25aand 39a, the cage 7 and the plate 107, or arms 74 and 75, may be rotatedin either direction as a unit relative to the rotating wheel and themounting disc 16 fixed thereto so that when the vibration of therotating wheel is reduced to a minimum,

the plate 107, or the component of the weightarms, is located in theside of the wheel opposite the heavy spot therein and, in the case ofthe arm weights the latter are located on opposite sides of and equallydistant from a diametrical line passing through the heavy spot of thewheel. Stopping or slowing downthe rotation of one of the two knobs 49aand 63a with the rotating .wheel causes the two arms 74 and 75 to moveequal distances toward one another, thereby increasing the effectivecounterweight; and a similar manipulation of the other of said knobscauses said weight arms to move equal distances away from each other fordecreasing the counterbalancing efiect thereof. When the arms 74 and 75are diametrically opposite each other, they are in equilibrium and haveno counterbalancing efiect on the wheel; and when they are swungtogether they provide a maximum counterbalancing effect. Similarly,Whenthe plate 107 is extended radially its counterbalancing effectisincreased, and when it is radially withdrawn to a Gen tered position(full line in Fig. 10) its effect is practically neutralized. Thus theplate 107 has its mass mov-.

able along a line which intersects the axis of rotation and when themass is on such rotary axis it has no effect as a balancing weight.

The operation of the device illustrated in Figs. 10, 11 and 12 of thedrawings is similar to that described in the embodiment of the inventionforming the subject matter of the said prior application, Serial No.109,641. The plate 107 being moved oif center in ways 111 and thenrotatably adjusted on the gear ring 17, will point the position at whichthe counterweight is to be applied to the rim.

From the foregoing it is obvious that the hereinbefore described wheelbalancing device is light, strong, durable, compact and simple as wellas economical to manufac ture. The device can be easily carried by thehand and readily mounted on and dismounted from the wheel as a completeself-contained unit. The location and magnitude of the correction weightrequired to balance the wheel can be quickly and easily determinedmerely by lightly gripping the different readily accessible centralknobs of the unit as it rotates with the Wheel.

Obviously, the hereinabove described balancing device admits ofconsiderable modification without departing from the invention.Therefore, I do not wish to be limited to the precise construction shownand described.

What I claim is:

l. A device for determining and correcting the dynamic unbalance of arotating wheel comprising mounting means adapted for removableattachment to one face of a wheel, a frame structure operatively carriedon said mounting means substantially centered on the wheel axis forrotation with and relative to the wheel, balancing Weight means, meanscarried by said frame structure to support said balancing weight meansand limit movement thereof to movement radially in and out relative tothe axis of wheel rotation, selectively operable means carried by andprojecting axially outwardly of said frame structure, said selectivelyoperable means being connected to said balancing weight means andmounting means for selectively rotating said frame structure andbalancing weight means relative to said mounting means and for changingthe radial position of said balancing Weight means relative to the axisof wheel rotation, and rotatable control elements connected to saidselectively operable means, said control elements being locatedsubstantially in the axis of wheel rotation outwardly of said balancingweight means.

2. A device for determining and correcting the dynamic unbalance of arotating wheel comprising mounting means adapted for removableattachment to one face of a wheel, a frame structure operatively carriedon said mounting means substantially on the wheel axis for-rotation withand relative to the wheel, balancing weight means, means on said framestructure opposite the wheel face to support said balancing weight meansfor movement in a linear path directed radially relative to the axis ofwheel rotation, selectively operable means supported by said framestructure and connected to said balancing weight means and mountingmeans from one side of said mounting means for rotating saidframestructure and balancing weight means relative to said mountingmeans and for changing the radial position of said balancing weightmeans relative to the axis of Wheel rotation, said selectively operablemeans including operating shaft means extending outwardly of said framestructure along the axis of wheel rotation, and control elementsoperatively connected to said shaft means and being positionedsubstantially on the axis of wheel rotation adjacent the outer ends ofsaid shaft means.

3. A device for determining and correcting the dynamic unbalance of arotating wheel comprising mounting means adapted for removableattachment to one face of a wheel, aframe structure movably connected tosaid mounting means outwardly of the wheelfaceand substantiallycenteredwith the wheel axis for 'rotation with and'relative to thewheel, balancing weight means, means on said frame structure spaced fromthe wheel face to engage said balancing weightmeans andlimit movementthereof to movement radially inwardly and outwardly-of the axis of wheelrotation in a plane parallel to the wheel face, shaft meanscarriedby-said frame structure and-extending outwardly thereof along the-axisof wheel rotation, selectively operable means carried by said framestructure at one side ofsaid mounting means and-operatively connectingsaid shaft means with said balancing Weight means and with said mountingmeans, certain-of said selectively operable meanseifecting a change inthe radial position of said balancing weight means relative to the axisof wheel rotation, and certain others-of said selectively operable:means effecting rotation of said frame structure and balancing weightmeans relative to said mounting means, and substantially axiallycentered control elements operatively connected'to-the outwardlyextending end portions of'said shaft means.

4. A device for determining and correcting the dynamic unbalance of arotating wheel including: a mounting frame adapted for removableattachment to one face of a'wheel;a frame structure extending axiallyoutwardly of the wheel face and movably connected to said mounting framefor rotation with and relative to the wheel; a balancing weight disposedaxially inwardly of said frame structure; means operatively connectingsaid balancing weight to one side of said frame structure for rotationof said balancing weight with said frame structure upon rotation of saidframe structure with and relative to said mounting frame, and forlimiting bodily displacement of said balancing weight to movementradially relative to the axis of wheel rotation; separate selectivelyoperable means carried by said frame structure at the other side of saidmounting frame, one of said selectively operable means being connectedto said balancing weight to effect a radial change of-position of saidbalancing'weight, and another of said selectively operable means beingconnected'to saidrnounting frame for rotating said frame structurerelative to said mounting frame; and control elements located axiallyoutwardly of said frame structure substantially in the axis of wheelrotation for controlling the operation of said separate selectivelyoperable means.

5. A device for determining and correcting the dynamic unbalance of' arotating wheel including: a mounting frame adapted for removableattachment to one face of a wheel; a frame structurecarried on saidmounting frame substantially centered'with the axis of wheel rotationand rotatable with and-relative to said mounting frame; guide means onsaid frame structure; a balancing weight slidably mounted on said guidemeans and constrained thereby to linear displacement in a radialdirection relative to the axis of wheel rotation, said guide means carrying-said balancing weight with said frame structure upon rotation of'thelatter with and relative to said mounting frame; controllable operatingmeans carried by said frame structure at one side of said mounting framein position connected to saidbalancing weight and to said mountingframe, said controllable operating means including shaft means extendingoutwardly from said frame structure along the axis of wheel rotation;and control elements mounted upon said shaft means for selectivelyenergizing said operating means upon wheel rotation, at least one of's'aidcontrol'elernents being adapted to rotate said frame structure andbalancing weight relative to said mounting frame and at least one otherof said control means being connected to said shaft means and adapted toeffect a radial change of position of said balancing weight relative tothe axis of wheel rotation.

6. A device for determining 'andcorrecting the -dynamic unbalance of arotating wheel including: a mounting frame adapted for removableattachment to the face of the wheel; rack means fixed on said mountingframe centered to thetaxis of wheel rotation; a frame structure carriedon said mounting frame centered to the axis of wheel rotation, saidframe structure extending outwardly at one side of said mounting frameand being rotatable with and relative to said mounting frame; abalancing Weight; means carried by'said frame structure for connectingsaid balancing weight thereto for rotation with said frame structureandfor bodily displacement in a direction radially in and out relativeto the axis of wheel rotation; selectively operable gear means carriedby said frame structure, certain of said gear means being in positionoperably connected to said rack means'for rotating said frame structureand balancing weight asa unit relative to said mounting frame, andothers of said gear means being operably connected to said balancingweight for bodily displacing said weight means in the radial directionin and out relative to the axis of wheel rotation; and control elementslocated in the axis of wheel rotation outwardly of said frame structure,said control elements being operatively connected to said gear means toeffect selective operation thereof.

7. A devicefor determining and correcting the dynamic unbalance of arotating wheel comprising a mounting frame removably attached to a Wheelface, a gear rack disc fixed on said mounting frame substantiallycentered to the wheel axis, a frame structure operatively carried at oneside of said mounting frame adjacent said gear rack disc for rotatingwith and relative to said mounting frame, balance weight means; meansoperatively carried on said frame structure and connected to saidbalance weight means for bodily displacing the latter in and out in aradial direction relative to the wheel axis, coaxial shaft meansextending outwardly from said frame structure along the wheel axis,gearmeans carried by said frame structure, certain of said gear meansoperatively connecting certainof said coaxial shaft means to said gearrack disc and others of said gear means connecting certain other of saidcoaxial shaft means to said balance weight; andcontrol elementsoperatively'connected to the outward ends of said coaxial shaft means inthe wheel axis to operate said shaft means selectively for effectingoperation of said gear means.

8. A devicefor determiningand correcting the dynamic balance in a wheelcomprising: mounting means adapted for removable attachment to one faceof the wheel to be balanced, frame means operatively carried on saidmounting means to rotate with and for rotational adjustment relative tosaid mounting means about an axis substantially in the axis of wheelrotation; movable weight means; means carried by said frame means tosupport said movable weight means and limit movement thereof to movementgenerally radially in and out relative to the axis of Wheel rotation;selectively operable means carried by said frame means, said selectivelyoperable means including control elements, which control elements aredisposed outwardly of said frame means and are mounted on said framemeans for rotation relative thereto about an axis substantially in theaxis of wheel rotation, and motion transmitting means continuouslyconnecting said selectively operable means with said movable weightmeans and with said mounting means for selectively changing the radialposition of said movable Weight means and for rotating said frame meansand said movable weight means relative to said mounting means when saidcontrol elements are selectively manipulated to change their speedrelative to wheel speed.

References Cited in the file of this patent UNITED STATES PATENTS

